Benghazi has seen bloody battles for more than two years between forces loyal to the internationally recognised parliament and armed groups, including the Islamic State of Iraq and the Levant group (ISIL, also known as ISIS).

Forces loyal to General Khalifa Haftar have regained several districts of Benghazi in recent months but have yet to retake the whole city.

The doctor told AFP that the 14 bodies were found in areas under the control of Haftar's men.

Security officials in the eastern city of Benghazi contacted by AFP declined to confirm or deny the killings.